Sun Genban, Sun Lingna, Wen He, Jia Zhiqian, Huang Kunlin, Hu Changwen
The Institute for Chemical Physics and Department of Chemistry, Beijing Institute of Technology, Beijing 100081, P.R. China.
J Phys Chem B. 2006 Jul 13;110(27):13375-80. doi: 10.1021/jp060916d.
Mg-Al spinel (MgAl2O4) nanorods and nanoplatelets transformed from Mg-Al layered double hydroxide (Mg-Al-LDHs) were synthesized via a combined hydrothermal method and calcination route using Al(NO3).9H2O and Mg(NO3)2.6H2O as raw materials. The nanorods and nanoplatelets were characterized by means of physical techniques, including powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microcopy (HRTEM), selected-area electron diffraction (SAED), Fourier transform infrared spectra (FT-IR), thermogravimetric (TG), and nitrogen adsorption-desorption isotherms. XRD patterns reveal that the Mg-Al-LDHs nanostructures were obtained under a hydrothermal reaction temperature of 200 degrees C and Mg-Al spinel nanostructures were fabricated via calcination of the Mg-Al-LDHs nanostructures at 750 degrees C. It can be seen from TEM that the sizes of the Mg-Al-LDHs nanoplatelets were about 20-40 nm and the diameters of the MgAl2O4 nanorods were ca. 6 nm. The HRTEM images indicate that the crystal lattice spaces of the MgAl2O4 nanorods and nanoplatelets are 0.282 and 0.287 nm, respectively.
以硝酸铝九水合物（Al(NO₃)·9H₂O）和硝酸镁六水合物（Mg(NO₃)₂·6H₂O）为原料，采用水热法和煅烧相结合的路线，合成了由镁铝层状双氢氧化物（Mg-Al-LDHs）转变而来的镁铝尖晶石（MgAl₂O₄）纳米棒和纳米片。通过粉末X射线衍射（XRD）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）、选区电子衍射（SAED）、傅里叶变换红外光谱（FT-IR）、热重分析（TG）和氮吸附-脱附等温线等物理技术对纳米棒和纳米片进行了表征。XRD图谱表明，在200℃的水热反应温度下获得了Mg-Al-LDHs纳米结构，通过在750℃煅烧Mg-Al-LDHs纳米结构制备了镁铝尖晶石纳米结构。从TEM可以看出，Mg-Al-LDHs纳米片的尺寸约为20-40nm，MgAl₂O₄纳米棒的直径约为6nm。HRTEM图像表明，MgAl₂O₄纳米棒和纳米片的晶格间距分别为0.282和0.287nm。
